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@gbj_tester
1: Spend about 12 hours in the wind tunnel with a bunch of stems and spacers to get a spreadsheet of Cd.A vs. position
2: Spend another 12 hours on a Wattbike to get a spreadsheet of threshold power vs. position
3: Combine the two spreadsheets to get a set of predicted speeds vs. position.
4: Select the position from the above tests which gives the highest speed at threshold power
5: Find the frame which gets you into that position with the least equipment drag, the best handling, and compliance with the regulations under which you're racing.
6: Go back to stage 1 when training/ageing has changed your shape and ability to generate power in various positions.
7: Repeat until bored, which could be another 50 years.